7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Johnson City | 1 | 74,263 | 71,121 | 0.85% | 1,707 | 44 | City |
| Jonesborough | 2 | 6,953 | 5,916 | 3.07% | 1,306 | 5 | Town |
| Oak Grove | 3 | 4,421 | 4,353 | -0.02% | 976 | 5 | CDP |
| Spurgeon | 4 | 4,018 | 4,426 | 0.1% | 983 | 4 | CDP |
| Gray | 5 | 1,290 | 1,342 | 0.39% | 868 | 1 | CDP |
| Telford | 6 | 1,010 | 990 | 0.6% | 409 | 2 | CDP |
| Fall Branch | 7 | 907 | 1,180 | -2.79% | 201 | 5 | CDP |
Johnson City is the largest city in Washington County, with a population of 74,263.
Fall Branch is the smallest city in Washington County, with a population of 907.
There are 7 cities in Washington County, Tennessee.